Bear Lake, Utah-Idaho 250,000 Year Proxy Data Kaufman, D.S.; Reheis, M.C.; Simmons, K.R.; Bright, J.; Dean, W.E.; Rosenbaum, J.G.; Moser, K.A.; Anderson, R.S.; Colman, S.M.; Heil, C.W.; Jiménez-Moreno, G. Kaufman, D.S. Reheis, M.C. Simmons, K.R. Bright, J. Dean, W.E. Rosenbaum, J.G. Moser, K.A. Anderson, R.S. Colman, S.M. Heil, C.W. Jiménez-Moreno, G. earth science/paleoclimate/paleolimnology (quartz,sediment,null,weight percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (calcite,sediment,null,weight percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (delta 18O,sediment,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Cytherissa lacustris) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,Candona sp. 3) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,Candona sp. 4) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,Candona sp. 7) earth science/paleoclimate/paleolimnology (Simpson diversity index,null,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes saccula) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria brevistriata rhombic) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria brevistriata oval) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria construens var venter) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria leptostauron) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria ulna) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia fonticola) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stephanodiscus niagarae) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,centric diatoms) earth science/paleoclimate/paleolimnology (delta 18O,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Candona sp.) earth science/paleoclimate/paleolimnology (total species,null,null,count,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cocconeis placentula) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cymbella mesiana) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria brevistriata total) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula cryptocephala) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella glabriuscula) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,pennate diatoms) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,C,Limnocythere sp. juvenile) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria pinnata) earth science/paleoclimate/paleolimnology (calcium carbonate,sediment,null,weight percent,null,paleolimnology,null,carbon coulometry,N,null) earth science/paleoclimate/paleolimnology (87Sr/86Sr,soluble acetic acid,null,dimensionless,null,paleolimnology,null,thermal ionization mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (weight,sediment,null,gram,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphora ovalis) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Caloneis sp. BL1) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cocconeis placentula var. lineata) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diatoma tenue var. elongatum) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Epithemia frickei) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria pinnata var accuminata) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula capitata var lueneburgensis) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula cryptotenella) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Surirella angusta) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella meneghiniana) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella ocellata) earth science/paleoclimate/paleolimnology (sample identification,null,null,null,null,paleolimnology,null,null,C,null) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,C,Cytherissa lacustris juvenile) earth science/paleoclimate/paleolimnology (notes,null,null,null,null,paleolimnology,null,null,C,null) earth science/paleoclimate/paleolimnology (depth,null,null,meter,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (delta 13C,sediment,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (total diatoms,null,null,count,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes lanceolata) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphora inariensis) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula oblonga) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Nitzschia sp. unid) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira granulata) earth science/paleoclimate/paleolimnology (plagioclase feldspar series,sediment,null,weight percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (aragonite,sediment,null,weight percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (delta 13C,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Candona sp.) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,Cytherissa lacustris) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Amphora pediculus) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria brevistriata) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria constricta) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria construens) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria tenera) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula tuscula) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Rhopalodia gibba) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Aulacoseira islandica) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella bodanica) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stephanodiscus medius) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stephanodiscus minutulus) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stephanodiscus sp. BL1) earth science/paleoclimate/paleolimnology (dolomite,sediment,null,weight percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,Candona sp. 1) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,unspecified ostracod) earth science/paleoclimate/paleolimnology (total ostracods,null,null,count per gram,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Achnanthes curtissima) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria biceps) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Fragilaria virescens) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Pinnularia viridis) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella michiganiana) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella rossii) earth science/paleoclimate/paleolimnology (organic carbon,sediment,null,weight percent,null,paleolimnology,null,carbon coulometry,N,null) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,Candona sp. 2) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Caloneis schumanniana) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Epithemia adnata) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula pupula) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella planktonica) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stephanodiscus neoastraea) earth science/paleoclimate/paleolimnology (total planktic diatoms,null,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (delta 13C,ostracod,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,Cytherissa lacustris) earth science/paleoclimate/paleolimnology (87Sr/86Sr,insoluble acetic acid,null,dimensionless,null,paleolimnology,null,thermal ionization mass spectrometry,N,null) earth science/paleoclimate/paleolimnology (identified ostracod,null,null,count per gram,null,paleolimnology,null,null,N,Candona sp. 5) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Diploneis elliptica) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Navicula rhynchocephala) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Cyclotella sp.) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stephanodiscus sp. unid) earth science/paleoclimate/paleolimnology (identified diatom,null,null,percent,null,paleolimnology,null,null,N,Stephanodiscus hantzschii) earth science/paleoclimate/paleolimnology (Bear Lake Utah/Idaho>LATITUDE 42>LONGITUDE -111.3333) A continuous, 120-m-long core (BL00-1) from Bear Lake, Utah and Idaho, contains evidence of hydrologic and environmental change over the last two glacial-interglacial cycles. The core was taken at 41.95°N, 111.31°W, near the depocenter of the 60-m-deep, spring-fed, alkaline lake, where carbonate-bearing sediment has accumulated continuously. Chronological control is poor but indicates an average sedimentation rate of 0.54 mm yrŋ1. Analyses have been completed at multi-centennial to millennial scales, including (in order of decreasing temporal resolution) sediment magnetic properties, oxygen and carbon isotopes on bulk-sediment carbonate, organic- and inorganic carbon contents, palynology; mineralogy (X-ray diffraction), strontium isotopes on bulk carbonate, ostracode taxonomy, oxygen and carbon isotopes on ostracodes, and diatom assemblages. Massive silty clay and marl constitute most of the core, with variablecarbonate content (average = 31 ą 19%) and oxygen-isotopic values (d18O ranging from -18 per mil to -5 per mil in bulk carbonate). These variations, as well as fluctuations of biological indicators, reflect changes in the water and sediment discharged from the glaciated headwaters of the dominant tributary, Bear River, and the processes thatinfluenced sediment delivery to the core site, including lake-level changes. Although its influence has varied, Bear River has remained a tributary to Bear Lake during most of the last quarter-million years. The lake disconnected from the river and, except for a few brief excursions, retracted into a topographically closed basin during global interglaciations (during parts of marine isotope stages 7, 5, and 1). These intervalscontain up to 80% endogenic aragonite with high d18O values (average = -5.8 ą 1.7 per mil), indicative of strongly evaporitic conditions. Interglacial intervals also are dominated by small, benthic/tychoplanktic fragilarioid species indicative of reduced habitat availabilityassociated with low lake levels, and they contain increased high-desert shrub and Juniperus pollen and decreased forest and forest-woodland pollen. The 87Sr/86Sr values (>0.7100) also increase, and the ratio of quartz to dolomite decreases, as expected in the absence of Bear River inflow. The changing paleoenvironments inferred from BL00-1 generally are consistent with other regional and global records of glacial-interglacialfluctuations; the diversity of paleoenvironmental conditions inferred fromBL00-1 also reflects the influence of catchment-scale processes. STUDY NOTES: Appendices A-D from Kaufman et al. 2009, containing mineralogy, isotope, ostracode, and diatom data from Bear Lake core BL00-1. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Kaufman, D.S. Investigator : Reheis, M.C. Investigator : Simmons, K.R. Investigator : Bright, J. Investigator : Dean, W.E. Investigator : Rosenbaum, J.G. Investigator : Moser, K.A. Investigator : Anderson, R.S. Investigator : Colman, S.M. Investigator : Heil, C.W. Investigator : Jiménez-Moreno, G. 2009-03-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/8650 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/utah/bearlake/bearlake2009bl00-1.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/utah/bearlake/bearlake2009bl00-1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/utah/bearlake/bearlake2009bl00-1.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/utah/bearlake/bearlake2009bl00-1.txt English https://www.ncdc.noaa.gov/paleo/study/8650 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/utah/bearlake/bearlake2009bl00-1.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/northamerica/usa/utah/bearlake/bearlake2009bl00-1.txt Kaufman, D.S., Bright, J., Dean, W.E., Rosenbaum, J.G., Moser, K.A., Anderson, R.S., Colman, S.M., Heil, C.W., Jiménez-Moreno, G., Reheis, M.C., Simmons, K.R. 2009. A quarter-million years of paleoenvironmental change at Bear Lake, Utah and Idaho. Geological Society of America Special Paper, 450, 311-351. START YEAR: 249950 cal yr BP * END YEAR: 0 cal yr BP -111.3333 42 -111.3333 42